US4808362A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hollow reinforced fiber structure formed by resin transfer molding
Assignee: ThyssenKrupp Budd Co
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Filing: 1987-06-04
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Granted: 1989-02-28
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Expires: 2007-06-04
Abstract
Abstract A method of forming a hollow reinforced fiber structure includes the steps of providing fiber reinforced material around a flexible expandable member and placing the resulting package inside of a mold which includes inner surfaces conforming to the shape of the structure being formed. A second expandable means is included in the mold on both sides of the package. After the mold is closed, pressure is applied to force the second expandable means against the fiber reinforced material. Resin is injected into the fiber reinforced material. The pressure is then decreased in the second expandable means as inflatable member is expanded to force the fiber material to conform to the inner surfaces of the mold. The fiber material is then cured to form the structure.
Inventors
- 👤 Richard B. Freeman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:23
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/42; B29C49/44; B29C70/00; B29C70/04; B29C70/28; B29C70/30; B29C70/34; B29C70/342; B29C70/40; B29C70/42; B29C70/44; B29C70/443; B29C43/00; B29C43/32; B29C43/36; B29C43/3642; B29C2043/3649; B29C43/02; B29C43/10; B29C43/12
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
162 words
A method of forming a hollow fiber structure comprising the steps of: a. providing a two-piece mold in open positions having inner cavity surfaces conforming to said fiber structure to be formed; b. providing a flexible expandable member c. placing fiber material around said expandable member; d. inserting expandable means in said mold and securing at the mold surfaces outside the mold cavity; e. inserting said fiber material with said expandable member into said mold in proximity to said expandable means to position said fiber material between said expandable member and said expandable means; f. closing said mold; g. applying pressure to force said expandable means against said fiber reinforced material; h. injecting resin into said fiber material, i. decreasing the pressure applied to said expandable means and applying pressure to expand said expandable member and move said fiber material to conform to said inner cavity surfaces of said mold, and j. curing said fiber material to form said hollow fiber structure.
Claim 2
Independent Claim
162 words
A method of forming a hollow fiber structure comprising the steps of: a. providing a two-piece mold in open positions having inner cavity surfaces conforming to said fiber structure to be formed; b. providing a flexible expandable member c. placing fiber material around said expandable member; d. inserting expandable means in said mold and securing at the mold surfaces outside the mold cavity; e. inserting said fiber material with said expandable member into said mold in proximity to said expandable means to position said fiber material between said expandable member and said expandable means; f. closing said mold; g. applying pressure to force said expandable means against said fiber reinforced material; h. injecting resin into said fiber material, i. decreasing the pressure applied to said expandable means and applying pressure to expand said expandable member and move said fiber material to conform to said inner cavity surfaces of said mold, and j. curing said fiber material to form said hollow fiber structure.
Claim 3
Dependent Claim
45 words
A method as set forth in claim 1 wherein said fiber material comprises a plurality of pieces disposed to slide on each other and move when said flexible expandable member is expanding with said pieces of fiber material being maintained around said flexible expandable member.
Claim 4
Dependent Claim
26 words
A method as set forth in claim 2 wherein said expandable member and said pieces of fiber material are placed in said mold in flat conditions.
Claim 5
Dependent Claim
33 words
A method as set forth in claim 3 wherein said expandable means comprise a pair of sheets disposed on opposite sides of the flat pieces of fiber material inside of said open mold.
Claim 6
Dependent Claim
37 words
A method as set forth in claim 4 wherein said inner surfaces of said mold include cavities and hold down elements are provided to hold down said sheets to cover said cavities when said mold is open.
Claim 7
Dependent Claim
25 words
A method as set forth in claim 5 wherein said two pieces of said mold include openings therein connecting sources of pressure to said cavities.
Claim 8
Dependent Claim
34 words
A method as set forth in claim 1 wherein said flexible expandable member includes folded material which unfolds into said cavities when said flexible expandable member is inflated by a source of gaseous pressure.
Claim 9
Dependent Claim
22 words
A method as set forth in claim 7 wherein a resin channel is provided to receive resin injected into said fiber material.
Claim 10
Dependent Claim
29 words
A method as set forth in claim 8 wherein a vent channel is provided to vent air from said fiber material as it receives resin from said resin channel.
Claim 11
Dependent Claim
26 words
A method as set forth in claim 9 wherein said hold down elements and said sheets provide a seal therebetween when said mold pieces are closed.
References Cited (Backward Citations)
US2711985A
Cited
US3135640A
Cited
US2975476A
Cited
US3879160A
Cited
US4123494A
Cited
US4148597A
Cited
US4312829A
Cited
US4647327A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-02-28 | 1992-08-29 | 1993-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-28 | 1996-08-29 | 1997-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-28 | 2000-08-29 | 2001-02-28 | $7700.00 | Window Closed / Lapsed |